12656642005 has 16 divisors (see below), whose sum is σ = 17362560384. Its totient is φ = 8676400320.

The previous prime is 12656641997. The next prime is 12656642017. The reversal of 12656642005 is 50024665621.

It is not a de Polignac number, because 12656642005 - 2³ = 12656641997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80199 + ... + 178171.

It is an arithmetic number, because the mean of its divisors is an integer number (1085160024).

Almost surely, 2^12656642005 is an apocalyptic number.

It is an amenable number.

12656642005 is a deficient number, since it is larger than the sum of its proper divisors (4705918379).

12656642005 is an equidigital number, since it uses as much as digits as its factorization.

12656642005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101676.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 12656642005 in words is "twelve billion, six hundred fifty-six million, six hundred forty-two thousand, five".